Make a rigid body bounce from an angle
One way to do this is using particles. First add a Sphere and Tab into edit mode and move it in the Z-axis till the origin is at the bottom.



Move this Sphere to a different layer. Next add two Planes. One will be used for generating the ball and the other will be used as a floor. And place them in a manner shown below. Make the floor large enough.



Now, select the floor and go to the "Physics" tab and toggle "Collision". Then select the plane at the top and add a particle system to it. Set the Emission Number to 1. Increase the Lifetime to the length of your animation. Then scroll down to "Render" and toggle "Object". In the "Dupli Object" select the Sphere. Then increase the size to the desired level. Check off "Emitter" so the plane doesn't show up in your render. Now go to "Velocity" and set the starting speed on the Z-axis. Finally press Alt+A to animate.